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Employee Benefit Plans (Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net actuarial loss (gain) $ 1,210 $ (545)
Settlement gain
Curtailment - prior service cost
Net actuarial loss settlement expense
Amortization of net actuarial loss (gain) (451) (475)
Amortization of prior service cost
Total recognized in accumulated other comprehensive loss (gain) 759 (1,020)
Postretirement Benefit Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net actuarial loss (gain) (237) (74)
Settlement gain
Curtailment - prior service cost
Net actuarial loss settlement expense
Amortization of net actuarial loss (gain) 282 317
Amortization of prior service cost (14) (14)
Total recognized in accumulated other comprehensive loss (gain) $ 31 $ 229